Improvement in dental plugging-instruments



UNITED STATES PATENT (DEEIoE.`

G. B. SNOW AND T. G. LEWIS, OF BUFFALO, NEW YORK.

IMPROVEMENT IN DENTAL PLUGGlNG-INSTRUMENTS.

Specification forming part of Letters Patent No. 59,784, dated November 20,1866.

To all who-m it may concern:

Be it known that we, GEORGE B. SNOW and TEEonoEE G. LEwis, of the city of Buffalo, county of Erie, and State of New York, have invented an Improvement in Dentists Plugging-Instruments; -and we do hereby declare that the following is a full, clear, and exact description thereof, having reference to the annexed drawings, making a part of this specification, in which- Figure I is a vertical section of our improved instrument as a whole. Fig. II is a perspec- Y tive view of the portion thereof which is the subject-matter of the present improvement. Fig. III is a transverse section on line ab, Fig. I.

Letters of like name and kind refer to like parts in each of the figures.

The nature of this invention relates to so constructing a dental plugging-instrument that it may be used either as a hand-pressure instrument or as a spring-plugger,

' giving repeated blows, as may seem most desirable to the operator, and thereby enable the operator to graduate the force to the work to be done with greater nicety than by an y means heretofore employed.

The case which holds the working parts of the instrument is made up in two sections, A representing the upper, and A1 the lower section. It is in the form of a tube or hollow cylinder, and the lower section has a hollow Now, when the ring is turned to the position I shown in Fig. III, the projecting end of the screw S passes into the horizontal slot or'groove C, and locks the parts so that the tool-holder cannot move in either direction.

The instrument may be used as a handpressure instrument.` Then, to change it to give blows, turn the ring R, so as to place the screw in the slot or groove b3, and in the space between the two parts of the feather O, as shown in dotted lines in Fig. III. The instrument is unlocked and the operating parts are all free, so that repeated blows may be given. by the hammer F upon the head of the toolholder, and all the effects ofthe mallet thereby obtained.

A full and ample description of the constructionand operation of the several parts of this instrument having been given in the specification of the patent granted us on the 30th day of October, A. D. 1866, (No. 59,2S4,) excepting the improvements herein particularly described, we herein refer to said patent, deeming it unnecessary to repeat such description.

/Vhat we claim as our invention, and desire to secure by Letters Patent, is-

So constructing a dental plugging-instrument that it may be operated automatically to give repeated blows, or its operating part-s locked, so that it may be used as a hand-pressure instrument, substantially as described.

GEO. B. SNOW. THEODORE G. LEWIS.

Witnesses E. B. FoRBUsH, B. H. MEUELE. 

